HP ProLiant DL360 G4 Server series

HiI have an HP ProLiant DL360 G4 Server. On bootup i get the following error.805 - Unsupported Processor Detected.None of my hardware has been changed and I only have one processor in the server.On bootup it say's will only boot from ROMPAQ Utillity. When the server starts it gives the following beeps one long and one short one.